51891016 has 8 divisors (see below), whose sum is σ = 97295670. Its totient is φ = 25945504.

The previous prime is 51891011. The next prime is 51891017. The reversal of 51891016 is 61019815.

51891016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 43164900 + 8726116 = 6570^2 + 2954^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (51891011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3243181 + ... + 3243196.

Almost surely, 2^51891016 is an apocalyptic number.

It is an amenable number.

51891016 is a deficient number, since it is larger than the sum of its proper divisors (45404654).

51891016 is a wasteful number, since it uses less digits than its factorization.

51891016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6486383 (or 6486379 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 51891016 is about 7203.5419065901. The cubic root of 51891016 is about 372.9901743273.

The spelling of 51891016 in words is "fifty-one million, eight hundred ninety-one thousand, sixteen".